Extraction press



Feb. 17, 1948.

H. E. CROSBY EXTRACTION PRESS Filed May 25, 1944 2 Sheets-Sheet 1 n o oo O 0 0 00 o o ffom o o O 0 0 0 coeoococ 00 c 00 o o o o o o o INVENTOR.finer. 4: Ceaaz/ Feb. 17, 1948. H, CROSBY I 2,436,064

EXTRACTION PRES S Filed May 25, 1944 2 Sheets-Sheet 2' Zara [eaaax BY mI512.

H TTORNEY'J' Patented Feb. 17, 194

UNITED STATES PATENT OFFlCE Harry EQCrosby, Los Angeles, Calif.

Application May 25, 1944, Serial No. 537,290

This invention relates to an improved extraction press and has, for oneof its principalobjects, the provision of means for a more complete andsatisfactory expressing of oils from vegetable materials and moreparticularly the oil from citrus fruit peel.

. One of the important objects of this invention is to provide an oilextracting press wherein there exists means for free exit of the oilwithout forcing the same through the entire mass of the pulp. V

Another important object of this invention resides in the provision ofan oil press which comprises a conical outer shell in which ascrewthreaded pressure element operates and wherein the blades of thescrew are of varying pitch and so arranged that the greatest pressurewill be applied midway of the cone or funnel, this serving to avoidunnecessary clogging of the exhaust end.

Another and still further important object of the invention is toprovide an oil press for citrus fruit pulp or the like which is simple,strong and compact and which can be readily operated with a maximum ofefficiency.

Another object of the invention is to provide an adjustable outlet forthe exhaust pulp whereby a greater pressure can be built up in thedevice itself and better oil extraction accomplished.

Other and further important objects of the invention will be apparentfrom the disclosures in the accompanying drawing and followingspecification.

The invention, in a preferred form, is shown in the drawings andhereinafter more fully de-- scribed.

In the drawings:

Figure 1 is an elevation, partly in section, of the improved extractionpress of this invention.

Figure 2 is a detail view of one half of the cone or funnel element ofthe improved extraction press of this invention, showing the interiorthereof and with the screw element removed.

Figure 3 is a. detail plan view of the base-plate 62, showing theadjustable waste exhaust slots thereof.

Figure 4 is a perspective view, partly cut away, showing a detail of apreferred embodiment of a flushing system used with the apparatus.

Figure 5 is a perspective view of movable plate 23.

As shown in the drawings:

The reference numeral l4 indicates generally the body of the improvedextraction press of this invention. the same being provided withsupporting legs I2.

thespace between these shell walls 1 Claim. (Cl. -48) as a receptaclefor part of the expressed oil or juice. The container I4 is fitted withdischarge tubes l6 located adjacent the bottom thereof, and the top ofthe container I4 is closed by a housing or the like l8. This preventsoverflow. Another discharge tube or pipe for extracted oil leads fromthe center of the bottom of hollow screw 26. V i

Mountedinside the container M is a shell 22 which is also frusto-conicalin shape and of fairly heavy construction reinforced by. annular.integral ribs or the like 24.

The walls of this shell 22 between the ribs 24 areperforated as shown at34, sothat expressed oil. can readily flow out therethrough and into 22and: the walls'oi the container l4.

Fitted inside the frusto-conical shell member 22 is a similarly shapedscrew 26 having threads 28, which threads are of varying pitch, thepitch being at a minimum adjacent the central portion of the screw, aswill be evident from an inspection of Figure 1. This varying pitch ofthe threads brings the greatest pressure midway of the cone or funneland allows somewhat of an expansion of the pulp adjacent the exhaustend, in this manner eliminating any possible clogging of the pulp orpeel exhaust, which is accomplished through openings in the base of thecontainer Id.

The screw element 26 is made hollow, and the walls between the blades orthreads 28 are perforated as shown at 32. This perforated wall issufliciently heavy to resist all maximum pressure while, at the sametime, allowing a free passage of the expressed oil therethrough.

A shaft 40 is provided for driving the apparatus, this being attached toany convenient source of power, and a housing 42 is keyed to the shaft40, this housing being, in turn, fastened by means of bolts or the like44 to the screwthreaded conical expressing element 28-32.

A framework and bearing retainer is provided by the housing 3, thisbeing also fastened to the shell 22-24, and a peel hopper 48 extendsupwardly into this housing, as best shown in Figure 1. A supply spout 50or any other suitable means for feeding the raw peel to the hopper isalso provided. From the hopper 48 the peel passes into a space 58between the screw 26 and. the shell 22.

As shown in Figure 3 the base 62 of container l4 provides openings 30through which the waste remaining after the oil is expressed from thepeel is discharged. An adjustment of the capacity of these openings isprovided by two semicircular plates 23 actuated by lag-screws 25 havingreverse threading at opposite ends so that turning of the screws movesthe plates forward or backward thereby augmenting or lessening thecapacity of the openings and correspondingly affecting the pressureexerted by the screw 26 upon the mass contained within the space 58between the shell 22 and the screw 26. Mountings for these adjustingscrews are shown at 2'! and 29 and the square ends are shown at 3|.

In order to provide for cleaning of the apparatus without dismantlingsame a flushing system is provided whereby water or other desired mediummay be sprayed within the screw member 26, the space 58 and the oilchamber 60. This is best shown in Figure 4 wherein water from supplyline 54 is conducted through pipe 56' to perforated rings 52 at the topof space and oil high v percentage of extraction with a correspondinglysmall expenditure of mechanical energy. and a negligible .loss ofaoil.

I am aware that many changes may be made and. numerous details ofvconstruction varied throughout a wide range without departing from theprinciples of this invention, and I, therefore do not purpose limitingthe patent grantedhereon otherwise than as necessitated by the priorart. a 1

Number I claim as my invention: v

An extraction press comprising a supporting base, a conical casingsurmounting the base, a conical extractor shell in the casing, the wallsof the shell being spaced from the casing walls, a conical screw in theshell and spaced therefrom, the walls of the shell and the screw beingperforated, the threads of the screw element being non-uniformly spacedand closer to each other adjacent the intermediate'portion of the screw,adjustable outlets in the base for extrusion of waste pulp, saidadjustable outlets including plates movable over outlet openings, screwbars for shifting the plates with respect to the outlet openings,andmeans for flushing the space between the extractor shell and theconical screw, saidmeans also including a flushing element for the base.

HARRY E. CROSBY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS.

Name Date Bussells Feb. 20, 1900 Johnson Aug. 24, 1915 Wertenhruch' Apr.8, 1919 Burrows June 29, 1920 Schueler Sept. 11, 1923 Kaptuller Dec. 4,1928 FOREIGN PATENTS Country Date ermany Feb. 3, 1913 France June 9,1933 Number

